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I'm looking for movie that I think was made between the 30's and 50's. It starts at a flash party at a house in the water where a couple leave in a boat for a house that has a boathouse. There's a murder in the boathouse it in the house where the boathouse is. I think there's an affair somewhere in there too. I also remember an alibi relating to a cafe and something to do with a clock relating to the alibi??

I think the one I'm looking for might be earlier than the 50's but gave that range just in case.

I'm pretty sure the murder takes place at the time the movie is set....after they leave the party in the boat.

For some reason I'm thinking there was a pretty big name in it....Bogart maybe or someone of that level at the time. I've looked through his movies on IMDB and can't see it as one of his but I really can't remember much else so it's hard to say.